Abstract: Case is the integrated representation of the human sense, logics and creativity. Cascbased Reasoning (CBR) is the simulator of human analogy learning, great achievement has been acctuired for CI3R in the field of knowledge lack.This paper discussed the logic rationality of C13R and the case intelligent decision techniques. hhe intelligent decision support system (IDSS) that is built from CBR can overcome some defects,such as poor flexibility of traditional IDSS,and provides decision support This decision support system technique and the aspect of research and development about case decision support system were investigated in the end.

Key words: Case-based reasoning, Case logics, Case decision techniques, Case decision support system